/Engine/Source/Editor/CurveEditor/Public/RichCurveEditorModel.h
Get neighboring keys given the key handle
virtual void GetNeighboringKeys ( const [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) InKeyHandle, [TOptional](API\Runtime\Core\IO\TOptional)< [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) > & OutPreviousKeyHandle, [TOptional](API\Runtime\Core\IO\TOptional)< [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) > & OutNextKeyHandle ) const